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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d904f7363e1c2986e7a19a30e12aeb40bc9c3d785be96edba9cc32a01277f3f' 
  AND token = 'unhm0hPh5TTfh8T2zNpnnDI2njpYnBZr8gCOIVFlV7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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