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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5110bc3b2a0d5168d2463a0388140c3ba5fa0fd692e7fa6326007d7d2d7c663' 
  AND token = 'DGfUF0P9KZxdEvW+lBwfuSkOBpkowelrNRTABFnOFzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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