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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5a5b5a1b7f98088a21ccadb99c375bae36b517fb2b8c4654264dc7710d9d56' 
  AND token = 'fq3ztRuQJ8BkpdcSIE47WT3yTPpdA+aLrS6NDXayV9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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