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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c299c7d5efafb9cf45c5529e2668f028f5376269936be9f27e522da6102c15' 
  AND token = 'tA3S8uFlYTjJNH7tUY2+Wz3+cMGyZEiCx0Cxb4Puu9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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