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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f12b839e6aa96eb25b1ce950b427943f760485daf47f7b24366602e0831efad' 
  AND token = 'ugNsPkYZ4vZ7oh1c54ljk+3JhE23g4iT7P19RPIs28E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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