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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32328c435ecd2730e9857c387e0a7d5abca2da7d8af4fe8bcb55ab8d4016f985' 
  AND token = 'U5h+lW+5NuDTH6Z51FQ6w60XNZiYKJmxDmJWs/6U1xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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