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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7addbb687bcf43d2c8b48a1e27ac25220675f1ea25912a5b7486ce49292c96e' 
  AND token = 'DJIpIWMry2pwoKL0OQ1WO5Dgfq1B/OdG4CFIMlMKcJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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