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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d9c9c6ec24585d47b1d074fa47c70e7314de0010af3d41e1c953bf6370e78a' 
  AND token = 'cfbFGGKsulUUaIQYbNlL/qLxl20fhv5cEndvnoLp8yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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