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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5177ddf4c04913b4ee65673e491ad9b1f4c53e673dac789aecc303ef97269c' 
  AND token = 'Q1QkIeu0E8+tzBwY09V+vsq3bUf0qyYeKIgNXJ5ILVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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