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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616ba7203b4f446c92de8cd4ed8d143a1f7311da44b9f90fbe2ffa45614fdb31' 
  AND token = 'uRsIQME6qcnG4Dm8d0TtPPhR7pgJcKcDesdhiXAaxtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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