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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751a605cb603bd804ca5f5c9c84ee9e1e46d2e4ebf6847331d54e0a087e2c3e2' 
  AND token = 'HgitNKGLeZMoANoD3vWadruMYegYe473UT+mhCePqto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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