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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d99b18286dd4c291431c1c684dbf5627bb0bd614a1711295e1d035651fcfe6' 
  AND token = 'yXd5crZ022LPTaCE1wSW8Js6P0V/1u2/GX3QaDp9eNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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