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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66abb4881bc8350745b232cfd441dfd9f5efc22f01e070b3fb18d1d86c4f6e12' 
  AND token = 'ixGT73hkX9zgEakw7piiLyNyWyryXOCWojc+YnDd8qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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