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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9809d762c99ce429dc6b2d9705108bab2d72ed84a6c9a9eff49ba35d043d0beb' 
  AND token = 'cXKYgcQdJIlfWihouCQiTM/+0NJER7nsE7SX4IuXd6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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