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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b3c907ff72c6cae88c2f05ba90979da3a38fc31b528031dadab5f923989213' 
  AND token = 'INQUXqmbR60lHHjETHc77DgxSrTqC9ZP7Q5XojKLAbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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