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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169523f3b24f15dba31afb70a606441972a23ed0a4f52c7c5177bcbe4e3e7b7e' 
  AND token = 'ZRmhBkKX4VZehDcyqKLFuttT4aesYusYGQhp3VbZCWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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