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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e5d952da7ef95e0dbf39947a043629fa9477e14c047c8368ec3e6f7105e599' 
  AND token = 'vF7rY1MO2cEZ6fmjKziFAvwctfZj0HS+oSQNUV7AZ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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