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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae1f1104b701471330ba00f6e1c3b8f783c17ce2d6e671d7ebad8a235f0d7bc' 
  AND token = 'ZS59tY3c1dKj6rywbV2ZntuxhDI9EdhLteCsx7MO+uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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