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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9acbaa263c83211bca6e1f8f1f5acd2bd18c28311ec557fd80b15df477ed603' 
  AND token = '8TbkRxyvczYYyGQySCHR1VU5XdJ4S/oW3IaLoCdV530=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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