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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17101e0bfae9a35011efcfe176c4b0e2e8d1e65a90739cd548400d65fd6e7972' 
  AND token = 'KvXROb/wYfOub3kqIBIQiKTUVIcduOQoiCpq+p42yHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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