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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3fa5a54e1be69cb13d14cbb455e3a72e9e171a14b09eb336d4b9f88f41f7bd' 
  AND token = '3CQA4Xh8u47CeO3oQYsQH6OqlMYzoXse5HlReh18rQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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