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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fa7ae06fc74cdd5442d2fb9cbc95f52dceb8f57a8b0afea78c0959b0e1b5be' 
  AND token = 'RjuepJgc27e8RIc3ZvXkSwgQgsgls/q3vGlh5bJ4sZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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