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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47a6fceff25f9f67d81eb9e6d8a2f4ccf555b146eb4821dd4a454416ea08dbd' 
  AND token = 'tZGvFsMpL8HOF9pbdW91jxdmN+UJTv+8egkjfcFQdlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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