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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91506309bba1acfab90767aebdea85f8f1fb04bb41b924c703c15bc1d8775f44' 
  AND token = 'jsE7pVdq4fQmqdD0oXo9+O69A9kA7OjIbsgWahXm/j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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