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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bfd3b5fde433313604d8442808d9728138f12f65d36f0da0ecd747d463bdd7' 
  AND token = '4AACqmyTU0cyqL+2efoa6eDMiYG6CvaV6bQNEkuAv7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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