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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc0d73390d15ef58567dbb25ef6cb4bf664a02a999446c9c98bdf50583dd8c9' 
  AND token = 'ZOOKasXk18hDo5IH35nGkmKYi9dEXhR8dQv8vrrVvqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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