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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89873b0ab84b3e7c0fddee7f3a325541eaa9f44008ea3053081619a029b01ee6' 
  AND token = '0jCx5fWIMEESf/FmzStCuR3iRwqRiwTiPgbMquQL5j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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