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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cfcba0805af438884859b3844e78496725f3260c34225b7b0d8be0213dd573' 
  AND token = 'iRrnIzezFfN0vMY0uOMqCb98vSW/aCo4GMQI+rkjl+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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