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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969d3acae0613b3ae15c925d46cee2d6644c080b96fd5b6a6a179cf3c1bc8622' 
  AND token = 'OoEt2IHKmtA+FvBRy26seqEFAXG9XF3sN80t9/BiJic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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