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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c3e9e89f14c518e54aaa36da73425b657a7e5970ccf311fdb5172cd569e5f1' 
  AND token = 'PLD5iV/0OzRlH7puPpr43s9fjTPC+jVAMTm3xb7ShP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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