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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c0eef2b427ead540d882ec83355bf1b5c272b84b3cf605b709bb7ac8d453ba' 
  AND token = 'yIAhEy+Lrh/nUQoOjaE9GfFNKIzcs4HkfOugb4jUvic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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