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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56ad451c435031946836f64232e9118f2bfde29c2138d8383ce2ab6c5a651f0' 
  AND token = 'fHy5logqlTQDWaMQ3yNfXH9p2RH2ArMKM2qcJCHKVDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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