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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa3382f5663147729ce331d4bb50363002c4674aa46ae426b1b38aca1bdd47e' 
  AND token = '7jMqD92fMN9lb5Hh6M082SlZr8oxOVSX4lrNOH8KYrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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