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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5f7b2710df838b2ed9b74b1e35e29a3ed71ef90a4b8c968e8a1f7722a3116c' 
  AND token = 'Y9/cj9+fNoR98tZhN57mNtn/8Gx7cXummm5Afh5beUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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