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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaaf6d57a8ab9f84ed83975b0b7e5247c590d61194d153da4ef9589d87cc175' 
  AND token = 'I5M5UBy86jSMRMZfj675a6/5lKq41qF1Rs9bZ09Sr+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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