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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d23d2dd6bc1684d92c42d0e1c9c7011b87383f597a510dc27b6fc67d3e4f9f' 
  AND token = 'D6WYsV0kDP91CnUIWnXyGsj3BEOEM6tNodFZvs+YSME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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