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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4243fc57f74d3f3342eb9904672a80158369c209c5a7b08aea3bf771a1dfa7' 
  AND token = '5Sg97OJv0f6fsrtuARKHMmbWmih6s4qo7daLXm9VI+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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