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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55f0a1a01a4bf9f8561c1f9433c149cb09a800fe211d3dc8d88ef07c186cb12' 
  AND token = 'DreAkK2qCsyj89AE3fmWmRZRFqH3AY0K2msE4HV20CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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