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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611d8c5077597240813bd3f9242754a6dfd796f3ca7f6f292a6e1769ecbedeb7' 
  AND token = '1UYwgjC9EV5V55WBSecGX55Tcw/QCC7b40uKNRkLda0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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