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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad617403b211fbe358538f80e41ae443a6a85e251e9606644bd3bbb0baf9bca' 
  AND token = '2dYLXdQHWESZZqwtA5sRkQCDA1q0bcL+R4llXzr8iUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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