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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c6fbf108c40c3c3900feb6d49289eb911f3f4e4482b353f505a5de984a7c9a' 
  AND token = '/u5MtVQngIAJqai2X/c/9v4Mu6sy4XPFwAqrjf5Y+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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