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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbd6d036cb1ab9f378b5fee7196e6e1f9a0096af48eb46ce77e025a01458ae7' 
  AND token = 'sEpY0pkDKt1jl27lPibwdLXFrmZ7siAt8nNc5Q2a+cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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