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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a62fff625fc8ebe6c5aadc1ab6e6acea2946637ae361a2af8d72a113287291' 
  AND token = '3my65qt/EHO5fkx61lS7PLDPX2SQwlRb/+Dwc7oL4Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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