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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaf38a119915ce9eaa823bd59b10a3c278b5d940a405825f5e1d033f3671ab0' 
  AND token = 'EuvdEeSQ0Ic+0ih+OVqUrAXKuZ1kkNgdPzWLmYoO7ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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