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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5294554730f4acc52f9723dc05b5efa33ccaf9acefcf7bb94c76e227de37fd7' 
  AND token = 'buKJHYVr1871DCQDnVq1YtpBvt9JM1wuq/P4TJ75YHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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