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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b4644c1c02e194364e524b7e6c333901a037a2c91890273e7304a9f097a2fb' 
  AND token = 'QzYvCCLFbXYwNO5dZZZxBPe2F7pNFoQHPkyqO7y2eQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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