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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060b2abf7b83be0d91ad62ee0e85388503aaf39b2bca662f5f64f718ed270d34' 
  AND token = 'r9McZnRXNM85AhI0pJ/Y3G9ty+WVi9ykjiPcac4Qx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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