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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79b28257c5070b782eac0a9e88ddcbc572f100d3fb877942e724350f4b50f8a' 
  AND token = 'OQkD87nQn+cy9D104NVIGDOdjNomxniXI7/tSoA4Ak4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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