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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3268eb46e685d00ea8d3669882e36b19a7c4e179d42732825905a39e99888aa0' 
  AND token = 'yeIUJarQQUDYHRtpj5tU0NeZhPHhrc3/N19yDcapj9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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