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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fc2e0f6e9c4a7bbc841c99e4fe3c679f815cd7d40cd16061db5ea1b7adfbe3' 
  AND token = 'v+7jbOg/GsMR1rCYnr0+Oks2rOTbx6npqUTJgdc+jp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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