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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da55fd28ee5890eda4d92ac0eb618853810f343a0bde402187ff948a4b5ba56' 
  AND token = 'ex3ENGVDwL4TGFPJZabmzXcO7qYx5ORgRF51wBMN3SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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