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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbb0042305f3b9b56caa7334261f4abc913e2e547e25b165b72b5055a4628db' 
  AND token = 'c/5sfVofzRtZ9N2XpJxnOv/vTXiZLJWBBaM0WDjUmls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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