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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575ed33feedf173bdefcf9b9d18a7de31846202a4fe29a2c35b7ecfac3bfb73b' 
  AND token = 'Byo8oeeJ7qG54NH1K+FAVWDpk8Fht5fLDTEg56DOrvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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