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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3135b9586716e308a3ecc4560e2f7b8f4ad224ce6cce242b4070a1e8abe6a4' 
  AND token = 'Oz0aydQRnYL6JWTefXyl0PbeeSbQBjYEgmsgtB8aIpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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