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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0946f1763cb27071f87b0ef961dae34ac33a36859c79c56815166baba866535' 
  AND token = '0hb0+FjnNOLNM8z2Qo/ytd1mQJJ4ZFjY7Hy/EdZHds8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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