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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c897f407b8b6ba26b214498b0ae8a772df7d3b8f2418eb574b5bddf7450ed56' 
  AND token = 'N3wLV8ZwG7M/++v8sxCq01992u28+/a9UyNQB95GtzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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