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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2311b7710fb9b2e4c6a02cb3bbed549d74a203e6eeb80986a36d6139c5ff60' 
  AND token = 'OId4B33TAABk3HbkGAsvNLN4/P4o2oh7KghZUkssfsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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