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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20136d3d84877c55ea5fea60940ebf402836a5c4a9a239d3f64dfc8c99369c54' 
  AND token = 'C50ekNaWdetAD5EQZE7Rnje+JJHgJGHelBt+STnLB/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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