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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6696acebb57962c7b0f83be194d732237122035cdf5c88d9e565f04fcf5a70c1' 
  AND token = 'ZfO7Ym1D/0XrnPC8qlSm7vT2T9WPOoW5X3ayhG4fYoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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