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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6570eb1b9b00a095eb1b4297fc5ca9519c7b57c1f6f8bec2791a340eab183ccd' 
  AND token = 'tmktQUZau0Btg/T1oEWBMdjmhQoNvLbEpsfACaIVaC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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