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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e977901afce16864e0b816cc032cda00d42838e660bc329ce3e660536f712bd' 
  AND token = 'pIfUShmYMduux73zP+A0+b/mGirdz/9aYNR37v3k+dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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