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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cbae7e73d6e953a1f1dd725b5e4dab5276d9d6ab82bf116718675be91c63d5' 
  AND token = 'ZdxqJl9z7+yfqnbm3v1/zoJvJ0dZs3o2RK5eDdeHYQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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