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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcaeff77d4c6c1c8daef02d22115cf2dbab30a7135d72eef2eb9300a80d2294' 
  AND token = 'B83zkOOaVo7NIiNf2yFczD6IrxlzXml2j7UStakyXrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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