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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218ac8c4a1dba6be1fc057687493e540448af2b8cc353ef0b3139a783b5c683b' 
  AND token = 'CHYtTAMHPr3s4I8kFPgYy5/XsINYDgV5IvAjxggFcP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}