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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26399fdcbf6f83be5581d14fe968365b0ba5edcea1dec0b9f79acd8bd6a7831b' 
  AND token = 'MwKlfqfibrKNMZyl2Fbuw4TuF9Q1/bSseU865SxS8/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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