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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3be4a32abd7f5565b6ab8985f8b0305ff15932da5c760ffb302b7e1344ecd8' 
  AND token = 'REiulL6TaeSfJLz0aBH9tsGq99GMrQx760dhZKMBB9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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