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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd47f3237460f0b84a89d1dbe7cef300f8b74c3176a56e91a1ee437c05831bcd' 
  AND token = 'GiheBIDwyw5s4Pg+ZeNnjU5gjeKDhsWQzs+EralsGMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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