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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17e05cc862a0989abd07b0b40b57e1777cf379e7b5e86229274be91b8b6d406' 
  AND token = 'sT46nIGSM7uWYUHPa2rDKY/Nmwtd6apMpg0M1oy1YIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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