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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bbbeade9ded275efc1380ac31b700afcf8c4768162e2e47dd4b24440bf1694' 
  AND token = 'le2goLfHY9jxLEosSX2mkzW2em7cj4P8qXKD4rwSGd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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