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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183c0934c1d64dee27ec91e1f73f8a5a995b8b2ad4d8f480220b6a8625436ab9' 
  AND token = 'GXlbp++DCN1zuJzXWeCIA3b9JF764gf+XjlRRVZNe7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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