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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b4a7c552c217efad769690272c0c0ee89a6fae805c00b8fded71b3fffd1cbc' 
  AND token = '1fgvOofo0d1Q/Tp11ujBLIDuCx8yYoPHgACeuqUGylo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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