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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96839af7dcf2d8a726ca0cf8d2ce8f65f5f968920c4ba2ac60f5efac62c50cb' 
  AND token = 'VC/IN9jfec76tGVW7fj6lHFOZZDE9ydrm9swKUMBO2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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