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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf91c2e83e6a2be366c82b47d530dda1c22765bda050f87139cbeb298c3c9ce' 
  AND token = '04xpatb7CcYyKgGwHA9qlS5z2R2TSGclaSIJZIAqGsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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