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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca938e0f57406e5ee516302e3596674a24f9728d214a6739d79c9690410fb538' 
  AND token = '3d3v1lX+xX+Pj2DOkwOUVRshD71+BM7QwYe+jyfc33U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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